Garrett GT 3071-63 turbo.

[blade7]

A 4 sylinder 2 valve non vvti head will never make good boost that low.
even if it makes boost, the engine design dont make any power under 3500-3800 rpm.
E85 will help you out.

E85 isn't an option. So you're saying a GT 3071-63 has no benefit over a K26-8 under 3500 revs?

[facboy]

Not that I understand these things but isn’t Garrett’s latest and greatest the G Series 2?

[ealoken]

Not that I understand these things but isn’t Garrett’s latest and greatest the G Series 2?

Yes, the new g30-660 will probably spool at 3500, vs 3800 on the old GT, and produce 500 hp Easily, but it's expensive.

[blade7]

15 years of development to spool 300 rpm earlier?

[944m3]

Isn’t the idea that it’s not the turbo but the 8v head and engine design? Meaning that same turbo might perform much better down low with a 16v head or maybe a highly ported 8v head?

I would be interested to see how a Xona , HPC, or Apex turbo would perform.

[Jotronic]

Chris White may have that info for 8v motors and 16v too.

My motor is basically done, just waiting on some piping since SFR is done and I have to source a header elsewhere. I'm using the Xona 6364s on mine. Getting antsy for the install and tune to begin.

[ealoken]

15 years of development to spool 300 rpm earlier?

On a modern engine, it's 500-800 rpm earlier in the game.

Our engine design are the limit.

[blade7]

15 years of development to spool 300 rpm earlier?

On a modern engine, it's 500-800 rpm earlier in the game.

Our engine design are the limit.

Not that I'll ever go there, but I've often read a KKK 26-6 has better low down pull than a 26-8. Wouldn't the Tial turbine housing and ball bearings match the 26-6?